The image below shows a homologous chromosome pair with two genes, A and B. Each
ID: 51453 • Letter: T
Question
The image below shows a homologous chromosome pair with two genes, A and B. Each of the two genes has two alleles (A1 and A2; B1 and B2). Use this information to answer the next two questions.
Q60. For this homologous pair of chromosomes, after completion of meiosis with NO CROSSING OVER, which of the following combinations of alleles might end up in one of the gametes?
A) A1 and B2
B) A2 and B1
C) A2 and B2
D) All of the above are possible.
Q61. For the same homologous pair of chromosomes shown above, which of the following combinations of alleles might end up in one of the gametes after completion of meiosis WITH CROSSING OVER?
A) A1 and B2
B) A2 and B1
C) A2 and B2
D) All of the above are possible.
Explanation / Answer
Q 60 - The correct answer is C) A2 and B2. Because when crossing over occur sister chromatid of chromosome change each other but there is no crossing over so they will remain same.
Q 61 - here crossing over occur so A1 chnage with A2 and secondaly B1 change with B2 so the all are possible
so the correct answer is D) All of the above are possible.
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